The　biocompatibility　and　surface　characteristics　of　dental　materials　surface-modified　by　an　amorphous　diamond　film　were　investigated.　The　dental　materials　are　poly(methyl　methacrylate)　(PMMA)　and　pure　titanium　and　the　amorphous　diamond　film　surface　was　produced　by　a　plasma　assisted　cathode　arc　discharge　under　vacuum.　The　biocompatibility　was　evaluated　by　cell　cultivation　and　animal　implants　and　the　wearability　of　the　PMMA　tooth　after　modification　was　analyzed　by　a　scratching　test.　The　surface　characteristics　of　the　film　were　characterized　by　SEM.　The　corrosion　resistance　of　the　surface　of　pure　titanium　dental　material　after　the　surface　modification　was　investigated　by　the　electrochemical　analysis　of　a　simulated　oral　cavity　filled　with　artificial　saliva.　Results　show　that　the　toxicity　of　the　amorphous　diamond　film　modified　dental　materials　is　zero,　and　the　hemolysis　ratio　is　3.08%.　After　polarization　pre-treatment,　the　PMMA　artificial　tooth　coated　with　an　amorphous　diamond　film　has　a　maximium　adhesion　force　of　10.86　+/-　0.79　N.　The　self-corrosive　potential　and　the　over-passivation　potential　of　the　pure　titanium　after　the　surface　modification　were　increased.　These　results　demonstrate　that　coating　the　surface　of　dental　materials　with　a　diamond　film　meets　the　requirements　of　biocompatibility,　anticorrosion　and　adhesion　strength.